Dye-bath.



and beta-naphthol on wool in the I fully the following example re em with dper cent. of the pcoonerron or GERMANY.

specification of Letters Patent.

AND ANTON OSSENBECK, 0F ELBERFELD, GERMANY, ASSIGNORS T0 ENFABRIKEN V0. FEIEDR'. BAYER 6f; GOQ'QF ELBEEEELD, GERMANY, A

nits-Bern.

1 in Draining. Original, application filed December 26, 1911, Serial No. 66756 5,. Divided and this application v filed Merck 20', 1912.. Serial No. 895,011.

lication 'oi ,our application No. 667,664,"

ed December 26, 1911, and concerns the production ofbrown to black fast shades on wool which can be obtained by dyeing to the one-bath method the azo dyes ob ained from nitro-2-aminophenols presence of a chrome mordant.

order to illustrate the new process more is given, the

are the dyedye': fi-chloro- 4-. new- 2- aminophenol beta 'naphthol, bring-'toithe boil, add 2' percent. of poarts being by weight:

tassium bichromate, enter the wool at .'60-80 0., bring to the boil, boil during i he and add owly 2-3 per cent. of acetic icig and continue boiling tori-1% hours.

tainedPfast to light, fulling and rubbing.

' other chrome compound or another of the above mentioned'dyes can be used e. .9.

dark brown fast shade is thus obdyes obtained from beta-naphthol and 4- mtro 2 ami'nophenol, nitro amino orthocresol, 5- or ii-nitro-4-chloro-2-aminophenol or nitro-amino-paracresol.

We-claim:- 1. An acid dye-bath comprising an un sulfonated azo d e obtained from beta-.

naphthol and a nitr0-2-amin0 henol andpotassium bichromate, substantially as described. v

3. An acid dye-bath comprising the azo- Patented Apr. he, sets. I

dye: 6 chloro 4 nitro-Q-aminophenol azobeta-naphthol and a chrome mordant, sub stantially as described.

4;. An acid dye-bath comprising the. azodye: 6 chloro 4 nitro-Q-amino henol azubeta-naphthol and potassium ichromate, substantially as described.

In testimony whereof we have hereunto set, our hands in the presence of two' sub-,

scribing witnesses.

MYRTIL KA. [L.s.] =ANTON OSSENBECK. [L.s.]

' Witnesses: i

Norm. A. Nurse. 7 

